Elevator casing



Nov; 6, 1928.

N. M. LOWER ETAL ELEVATOR CAS ING Filed Feb. 24, 1925 1 Pa xizzlson Kate/I720! Patented Nov. 6, 1928.

own-:1) STATES 1,690,739 PATENT OFFICE.

NATHAN M. LOWER AND PAUL ALLISON KETQ HPEL, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE STANDARD STOKEB COMPANY INC., OF NEW YORK; N. Y., A CORPORATION OF DELAWARE.

ELEVATOR CASING. I

' This invention relates to mechanical stokers and the principal object of the invention is the provision of newand improved means for preventing the unnecessary rota- 6 tion of the fuel about the screw elevator within the casing during its elevation.

Another object of the invention is the provision of an elevator casing having a roughened inner wall for increasing the efliciency of the screw elevator in elevating the fuel.

Other objects of the invention are the provision of new and improved elevator mechanism that is simple in construction, cheap to manufacture, efficient in operation, and that is not likely to become broken or get out of order. v 1

Other and further objects and advantages of theinvention will appear from the following descriptiontaken in connection with the accompanying drawing, in which T Fig. 1- is a rear elevation of a'portionof .a locomotive showing my invention in position thereon; p Fig. 2' a section on line 22 of Fig. 1;

' Fig. is a section on line 33 of Fig. 1. On the drawing the reference character 10 designates the backhead of a locomotive provided with an opening 11 through which fuel is introduced into the firebox 12. The elevator mechanism is shown at 9 and comprises one or more casings 13, only one being shown, within which is rotatably mounted a screw elevator 14. The elevator is rotated by any suitable means such as the motor 15 which operates through the rack 16 and the pinion 17 on the shaft 18 of the elevator. The upper end of the casing is provided with an opening 19 over which is secured a distributor member 20 of any approved construction.

In order to have access to the interior of the casing for relieving congestion, removing foreign bodies and the like from the casing, the same is provided with an opening 21 which preferably extends longitudinally of the casing. The opening 21 is provided with a suitable closure or lid 22 which is secured on the casing in any suitable manner as by means of the fastening element 23. In elevating fuel by screw elevators, the fuel has a tendency to rotate within the ele- 'vator, and under normal operating conditions the lack of sufficient friction between the fuel and the inner surface of the casing re.

sults in the fuel rotating with the-elevator with little or no upward advance of the same. Suitable means are provided for counteractmg this tendency. In the form of the device selected to illustrate one embodiment of the invention the inner surface of the casing is roughened as by providing inwardly extendmg pro ections thereon. As shown, this is conveniently accomplished by providing a plurality of projections or extensions 24 and 25 on the closure 22. These projections may be of any suitable configuration, that shown being in the form of ribs extending longitudinally of the closure.

The casing is slightly greater in diameter than the elevator, thereby increasing the frictional surface onthe casing for assisting in preventing the rotation of the fuel with the elevator. The ribs are extended inwardly in proximity to the flights of the screw elevator. The ribs extend inwardly beyond the inner surface of the casing proper and each is effective for engaging the coal to prevent its rotation with the elevator. These ribs are so arranged that they will all be effective in engaging the fuel irrespective of the direction in which the screw elevator is rotated.

It is thought from the foregoing taken in connection with the accompanying drawings that the construction and operation of our device will be apparent to those skilled in the art, and that various changes in size, shape, proportion and details of construction may be made without.departing from the spirit and scope of the appended claim.

\Ve claim as our invention In a stoker for locomotives and the like,

an elevator casing circular in cross section for said opening having a rib at each edge thereof extending longitudinally of said closure and projecting inwardly beyond the inner surface of said casing when said closure is in position thereon for preventing rotation of fuel within said casing.

In testimony whereof we aflix our sigma-- tures.

NATHAN M. LOWER. PAUL ALLISON KETGH EL' 

